HV9110X Ver la hoja de datos (PDF) - Supertex Inc
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HV9110X Datasheet PDF : 7 Pages
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Detailed Description (continued)
Error Amplifier
The error amplifier in the HV911X is a true low-power differential
input operational amplifier intended for around-the-amplifier com-
pensation. It is of mixed CMOS-bipolar construction: A PMOS
input stage is used so the common-mode range includes ground
and the input impedance is very high. This is followed by bipolar
gain stages which provide high gain without the electrical noise of
all-MOS amplifiers. The amplifier is unity-gain stable.
Current Sense Comparators
The HV911X uses a true dual comparator system with indepen-
dent comparators for modulation and current limiting. This allows
the designer greater latitude in compensation design, as there are
no clamps (except ESD protection) on the compensation pin. Like
the error amplifier, the comparators are of low-noise BiCMOS
construction.
HV9110/HV9112/HV9113
Remote Shutdown
The shutdown and reset pins of the 911X can be used to perform
either latching or non-latching shutdown of a converter as re-
quired. These pins have internal current source pull-ups so they
can be driven from open-drain logic. When not used they should
be left open, or connected to VDD.
Output Buffer
The output buffer of the HV911X is of standard CMOS construc-
tion (P-channel pull-up, N-channel pull-down). Thus the body-
drain diodes of the output stage can be used for spike clipping if
necessary, and external Schottky diode clamping of the output is
not required.
Pinout
BIAS 1
+VIN 2
Sense 3
Output 4
–VIN 5
VDD 6
OSC Out 7
14 FB
13 COMP
12 Reset
11 Shutdown
10 VREF
9 Discharge
8 OSC In
14 Pin SOIC/DIP Package
18 17 16 15 14
FB 19
BIAS 20
NC 1 •
NC 2
+VIN 3
13 NC
12 Discharge
11 OSC In
10 OSC Out
9 VDD
4
5
6
7
8
20-pin PJ Package
top view
©2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
7
11/12/01
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 • FAX: (408) 222-4895
www.supertex.com
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